<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区域-->
    <el-card>
      <!--警告区域-->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning" :closable="false" show-icon>
      </el-alert>
      <!--选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!--选择商品分类的级联选择框-->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            expandTrigger="hover"
            @change="handleChange" :props="cateProps">
          </el-cascader>
        </el-col>
      </el-row>
      <!--tabs 页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <!--循环渲染tag标签-->
              <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!--输入文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>

            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column lable="参数名称" prop="attr_name"></el-table-column>
            <el-table-column lable="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeEditDialog(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <!--静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <!--循环渲染tag标签-->
              <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!--输入文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>

            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column lable="属性名称" prop="attr_name"></el-table-column>
            <el-table-column lable="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeEditDialog(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--点击添加参数弹出对话框-->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>
    <!--点击编辑弹出对话框-->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      /* 存商品分类列表 */
      cateList: [],
      /* 级联选择框配置对象 */
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      /* 级联选择框双向绑定到的数组 */
      selectedCateKeys: [],
      /* 被激活的页签的名称 */
      activeName: 'many',
      /* 动态参数的数据 */
      manyTableData: [],
      /* 静态属性的数据 */
      onlyTableData: [],
      /* 添加对话框的显隐 */
      addDialogVisible: false,
      /* 添加参数的表单数据对象 */
      addForm: {
        attr_name: ''
      },
      /* 添加参数的表单验证规则对象 */
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      /* 控制修改对话框的显隐 */
      editDialogVisible: false,
      /* 修改的表单数据对象 */
      editForm: {},
      /* 添加参数的表单验证规则对象 */
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
    }
  },
  created() {
    /* 获取商品分类列表 */
    this.getCateList()
  },
  methods:{
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if(res.meta.status !== 200){
        return this.$message.error("获取商品分类列表失败！")
      }
      this.cateList = res.data
    },
    /* 级联选择框发生变化会触发这个函数 */
     handleChange() {
      this.getParamsData()
    },
    /* 获取参数的列表数据 */
    async getParamsData() {
      /* 长度不等于3，说明选中的不是三级分类 */
      if(this.selectedCateKeys.length!==3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      /* 否则说明选中的三级分类 */
      /*根据所选的分类id及当前所处的面板，获取对应的参数*/
      const {data: res} = await this.$http.get("categories/${this.cateId}/attributes/", {params:
          {sel: this.activeName}})
      if(res.meta.status !== 200){
        return this.$message.error("获取参数列表失败！")
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        /*控制文本框的显示与隐藏*/
        item.inputVisible = false;
        /*文本框中输入的值*/
        item.inputValue = '';
      })
      if(this.activeName==='many'){
        this.manyTableData = res.data;
      }else{
        this.onlyTableData = res.data;
      }
    },
    /* tabs页签点击事件的处理函数 */
    handleTabClick() {
      this.getParamsData()
    },
    /* 点按钮添加参数 */
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) return
        const  {data: res} = await this.$http.post('categories/${this.cateId}/attributes',{
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if(res.meta.status !== 201){
          return this.$message.error("添加参数失败！")
        }
        this.$message.success("添加参数成功！")
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    /* 监听添加对话框的关闭事件 */
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    /* 点击编辑按钮，展示修改的对话框 */
    async showEditDialog(attr_id) {
      /*查询当前参数的信息*/
      const {data: res} = await this.$http.get('categories/${cateId}/attributes/${attr_id}',{
        params:{attr_sel: this.activeName}
      })
      if(res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败！")
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    /* 监听修改对话框的关闭事件并重置 */
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    /* 点按钮修改参数 */
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return
        const  {data: res} = await this.$http.put('categories/${this.cateId}/attributes/${this.editForm.attr_id}',{
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if(res.meta.status !== 200){
          return this.$message.error("修改参数失败！")
        }
        this.$message.success("修改参数成功！")
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    /* 点删除按钮删除参数 */
    async removeEditDialog(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if(confirmResult !== 'confirm') {
        return this.$message.info("已取消删除！")
      }
      /*确认删除的业务逻辑*/
      const  {data: res} = await this.$http.delete('categories/${this.cateId}/attributes/${this.editForm.attr_id}')
      if(res.meta.status !== 200){
        return this.$message.error("删除参数失败！")
      }
      this.$message.success("删除参数成功！")
      this.getParamsData()

    },
    /* 文本框失去了焦点或按下enter键，都会触发该函数 */
    async handleInputConfirm(row) {
      /*trim():去除字符串两端的空格*/
      if(row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      /* 如果没有return出去，说明输入的内容有效，需要做后续处理 */
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      /* 并发起请求，保存此次操作 */
      this.saveAttrVals(row)
    },
    /* 对参数数组的操作，其他添加，删除，修改的地方可以直接调用 */
    async saveAttrVals(row) {
      /* 发起请求，保存此次操作 */
      const  {data: res} = await this.$http.put('categories/${this.cateId}/attributes/${row.attr_id}',{
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200){
        return this.$message.error("修改参数列表失败！")
      }
      this.$message.success("修改参数列表成功！")
    },
    /* 点击按钮展示文本输入框 */
    showInput(row) {
      row.inputVisible = true
      /* nextTick:当页面上的元素被重新渲染后，才会执行回调函数中的代码 */
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    /* 监听参数标签被删除关闭事件 */
    handleClose(i, row) {
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },


  computed: {
    /*添加属性或参数的按钮是否要禁用*/
    isBtnDisabled() {
      /*长度不等于3，返回true，则禁用*/
      if(this.selectedCateKeys.length!==3) {
        return true
      }
      return false;
    },
    /*当前选中的三级分类的id*/
    cateId() {
      if(this.selectedCateKeys.length===3){
        return this.selectedCateKeys[2];
      }
      return null
    },
    /*根据动态计算得到对话框的标题*/
    titleText() {
      if(this.activeName === '动态参数') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin-top: 15px;
}
.el.tag{
  margin: 10px
}
.input-new-tag{
  width: 120px;
}
</style>
